Displayport cable messes with computer power?

[TooFarBeyond]

I have a gtx 1070 and an asus VG248 QE monitor. My problem is that I have another monitor which only uses DVI or VGA connectors and I must use a Displayport cable with my monitor because that is the only cable which supports 144hz 1080p other than the DVI however my GPU only has one DVI input. The problem lies where if my computer turns off, I still have power to my case LED's however I cannot turn the computer back on without removing the DP cable. My question is, 1)How do I get this to work without having to unplug the DP cable to turn my PC on 2) Is doing this harming my GPU?

Extra info
DP cable is DP 20-pin Male, v1.2 (6 foot) iCAN brand.
Asus P8Z77-V LK
Intel Core I7 3770 non K
Coolermaster hyper 212 Evo
Gigabyte G1 GTX 1070 8 GB
16GB Corsair Vengeance RAM 1600mhz
Samsung 840 EVO 128gb
WD Caviar Black 2TB 7200RPM
EVGA 650W Semi Modular Bronze Power Supply
CM Storm Case

 

[Glenwing]

I have a gtx 1070 and an asus VG248 QE monitor. My problem is that I have another monitor which only uses DVI or VGA connectors and I must use a Displayport cable with my monitor because that is the only cable which supports 144hz 1080p other than the DVI however my GPU only has one DVI input. The problem lies where if my computer turns off, I still have power to my case LED's however I cannot turn the computer back on without removing the DP cable. My question is, 1)How do I get this to work without having to unplug the DP cable to turn my PC on 2) Is doing this harming my GPU?

Extra info
DP cable is DP 20-pin Male, v1.2 (6 foot) iCAN brand.
Asus P8Z77-V LK
Intel Core I7 3770 non K
Coolermaster hyper 212 Evo
Gigabyte G1 GTX 1070 8 GB
16GB Corsair Vengeance RAM 1600mhz
Samsung 840 EVO 128gb
WD Caviar Black 2TB 7200RPM
EVGA 650W Semi Modular Bronze Power Supply
CM Storm Case

Most likely you will need a different DisplayPort cable.

https://www.displayport.org/cables/how-to-choose-a-displayport-cable-and-not-get-a-bad-one/

Recently VESA has experienced quite a few complaints regarding troublesome DisplayPort operation that ended up being caused by improperly made DisplayPort cables. These “bad” DisplayPort cables are generally limited to non-DisplayPort certified cables, or off-brand cables. To further investigate this trend in the DisplayPort cable market, VESA purchased a number of non-certified, off-brand cables and found that an alarmingly high number of these were configured improperly and would likely not support all system configurations. None of these cables would have passed the DisplayPort certification test, moreover some of these cables could potentially damage a PC, laptop, or monitor. We have not seen problems with the cables supplied by major computer brands, or major computer accessory brands, nor have we seen any problems with any of the cables that have been DisplayPort certified.

http://monitorinsider.com/displayport/dp_pin20_controversy.html

When you read up on the DisplayPort connector in the VESA specification, it will show that both the source and the sink are supposed to provide power at 3.3V+-10% and 500mA on the DP_PWR pin, pin 20, of the connector.

DP_PWR is very useful to supply power to dongles that are connected to the source or the sink. Dongles always have a bit of electronics in them, and thanks to DP_PWR, you don't need a separate power supply wire.

The problem with this arrangment is that one should never ever connect the DP_PWR of the source to the DP_PWR of the sink: it's impossible for both pins to have exactly the same voltage, so connecting them together would effectively result in a short circuit condition.

In addition, if, your GPU is powered off, while your monitor is powered on, you get a problem that's commonly called 'backdrive': a sneaker path that feeds electrical compoonents in the GPU even though nothing is supposed to have power. This can result in your GPU behaving erratically when trying to power up. In some cases, it can even damage the GPU.

This is why regular DP cables should never have a wire between pin 20 of boths sides of the cable.

Yet some DP cable manufacturers never bothered to really understand the specification and flooded the market with some cheap cables that do exactly that. This was especially common for miniDP (mDP) to DP cables.

If you happen to have such a cable, your best advice is to throw it away and buy a new one that doesn't have this issue.

 

[TooFarBeyond]

I have a gtx 1070 and an asus VG248 QE monitor. My problem is that I have another monitor which only uses DVI or VGA connectors and I must use a Displayport cable with my monitor because that is the only cable which supports 144hz 1080p other than the DVI however my GPU only has one DVI input. The problem lies where if my computer turns off, I still have power to my case LED's however I cannot turn the computer back on without removing the DP cable. My question is, 1)How do I get this to work without having to unplug the DP cable to turn my PC on 2) Is doing this harming my GPU?

Extra info
DP cable is DP 20-pin Male, v1.2 (6 foot) iCAN brand.
Asus P8Z77-V LK
Intel Core I7 3770 non K
Coolermaster hyper 212 Evo
Gigabyte G1 GTX 1070 8 GB
16GB Corsair Vengeance RAM 1600mhz
Samsung 840 EVO 128gb
WD Caviar Black 2TB 7200RPM
EVGA 650W Semi Modular Bronze Power Supply
CM Storm Case

Most likely you will need a different DisplayPort cable.

https://www.displayport.org/cables/how-to-choose-a-displayport-cable-and-not-get-a-bad-one/

Recently VESA has experienced quite a few complaints regarding troublesome DisplayPort operation that ended up being caused by improperly made DisplayPort cables. These “bad” DisplayPort cables are generally limited to non-DisplayPort certified cables, or off-brand cables. To further investigate this trend in the DisplayPort cable market, VESA purchased a number of non-certified, off-brand cables and found that an alarmingly high number of these were configured improperly and would likely not support all system configurations. None of these cables would have passed the DisplayPort certification test, moreover some of these cables could potentially damage a PC, laptop, or monitor. We have not seen problems with the cables supplied by major computer brands, or major computer accessory brands, nor have we seen any problems with any of the cables that have been DisplayPort certified.

http://monitorinsider.com/displayport/dp_pin20_controversy.html

When you read up on the DisplayPort connector in the VESA specification, it will show that both the source and the sink are supposed to provide power at 3.3V+-10% and 500mA on the DP_PWR pin, pin 20, of the connector.

DP_PWR is very useful to supply power to dongles that are connected to the source or the sink. Dongles always have a bit of electronics in them, and thanks to DP_PWR, you don't need a separate power supply wire.

The problem with this arrangment is that one should never ever connect the DP_PWR of the source to the DP_PWR of the sink: it's impossible for both pins to have exactly the same voltage, so connecting them together would effectively result in a short circuit condition.

In addition, if, your GPU is powered off, while your monitor is powered on, you get a problem that's commonly called 'backdrive': a sneaker path that feeds electrical compoonents in the GPU even though nothing is supposed to have power. This can result in your GPU behaving erratically when trying to power up. In some cases, it can even damage the GPU.

This is why regular DP cables should never have a wire between pin 20 of boths sides of the cable.

Yet some DP cable manufacturers never bothered to really understand the specification and flooded the market with some cheap cables that do exactly that. This was especially common for miniDP (mDP) to DP cables.

If you happen to have such a cable, your best advice is to throw it away and buy a new one that doesn't have this issue.

I did see something like this, would one like this be good?https://www.amazon.com/gp/product/B0098HVZBE/ref=ox_sc_act_title_2?smid=A3DWYIK6Y9EEQB&psc=1
It claims to be VESA certified and has decent reviews. Also I was wondering if having this issue would have caused any problems with my graphics card or if I shouldn't worry, Thanks for the help I do appreciate it!

 

[Glenwing]

I did see something like this, would one like this be good?https://www.amazon.com/gp/product/B0098HVZBE/ref=ox_sc_act_title_2?smid=A3DWYIK6Y9EEQB&psc=1
It claims to be VESA certified and has decent reviews. Also I was wondering if having this issue would have caused any problems with my graphics card or if I shouldn't worry, Thanks for the help I do appreciate it!

Yes, the Accell cables are usually the recommended ones.

Can't say for sure if you have damage or not but I haven't seen very much hardware actually damaged by this, it seems to be a rare thing.